Keane's in New Zealand

I am seeking any information either in Ireland or New Zealand about William John Keaneand his wife Mary Jane. They migrated to New Zealand fron County Mayo, Ireland, in the 1860-70's William John was a Chemist The only child I know of was their daughter, my great grandmother, Mary Jane. Mary Jane married Nathaniel John Blair in Auckland in 1875 & moved to Australia in the 1880's. I do not know any other information about William John or his wife Mary Jane. Did they have any more children living in New Zealand ? Where & when they died ? Any information about them in County Mayo ?